Improved dental impression-cup



intrd fiatrt naar eine.

Letters Patent Nn. 98.066, dated December 21, 1.869.

Th'e Schedule rean-e6 to in these Letters Patent and making part of the same.

To all who-m it may concern.-

Be it known that I, Roer-:nr V. J'uNKs, of Paterson, in the county of Passaic, and State of New Jersey, have invented a new and useful Improvement in Dental Impression-Cup for lower jaw; and I` do hereby declare that the following is 'a full, clear, and exact description thereof, which will enable others skilied in the art to malte and use the same, reference heilig had to the accompanying drawings, forming part of this specification, in which- Y Figure l is an under-side view cf my improved impression-cup.

Figure il is a top view of the saine.

Similar letters of reference indicate corresponding parts. p

vl\ ly inrention has for its object to furnish an improved impression-cup, for use in taking a cast of the lower jaw, to form a model of said jaw to fit the plate upon, which shall be so constructed as to enable the dentist to take a more perfect cast than is possible with impression-'cups constructed in the ordinary manner; and

It consists in making the cup in two parts, as hereinafter more fully described.

A is the cup, which is madejn two parts, as shown in l and 2. This enables the inner flanges or sides of the cup, at its ends, to be turnedin more than is possible when the cup is made in onepiece, in the ordinary manner, so as to force tlie plastic material with which the cast is taken, around and beneath the processes upon the inner side of the rear parts of the jaws, thus making the model of the jaw a more perfect representation than is possible with cups made in the ordinary manner.

This construction enables the cup to be removed i from the cast after thc model has been moulded, without the liability of' breaking the saidmodel in removing the cup from the cast, which frequently happens with cups made inthe ordinary inauucr.

The outer ends of the part-s of the cup A should he provided with lugs and a clamping-screw, 0r with other means that will securely hold the said parts in place, and allow them to be' conveniently detached when desired. f

In using the cup it is first inserted in the patients mout-lr, to see .that it will properly receive vand fit yupon the jaw. It it does not t, its sides 0r flanges should be heut into propel' shape, or anothercast should be taken. The cup A is then filled wit-,h the material with which the cast is to be taken, and after said mateiial has partially set, so that it will not drop out,

'and while it is still plastic, the cup is adjusted and pressed down upon the jaw until-the patient feels the, edge of the cup striking against his cheek.

The c ast is then removed, and when vfully set is coated with shellacwarnish or other suitable material, and the model is moulded.`

lVhen the material that formsthe model is set, the parts of the cup are detached and removed, one at a time, from the cast, which can thus be done without any danger of breaking or injuring the model.

The cast is then cut, broken, or chipped away downv to the stain of the varnish, after which the rest of the east is carefully reiuored, leaving a 'perfect model of the jaw.

A plate made upon a model thus-formed will not rock in the mouth, and will enable the wearer' to bite' apples, crackers, or other hard substances with his front 4 teeth, without the said plates moving'or rocking in his mouth, from the fact that the peculiar construction of my improved cup enables an vexact impression to he taken of the rear inner processes of thejaw,s0 that the platemay be securely held in pla-ce by said processcs.

Having th'us described my invention,

Iclaim as new, and desire to secure by Letters Patent- An improved dental impression-cup, for the lowerv jaw, made in two parts, substantial'y'iu the manner herein shown and described, and'for the purpose set forth.

Witnesses: ROBERT V. JENKS.

H. C. HUDSON, W. ALLAN MILLER. 

